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                <h4 id="1-网络程序设计基础"><a href="#1-网络程序设计基础" class="headerlink" title="1.网络程序设计基础"></a>1.网络程序设计基础</h4><h6 id="局域网与因特网"><a href="#局域网与因特网" class="headerlink" title="局域网与因特网"></a>局域网与因特网</h6><p>服务器是指提供信息的计算机或程序，客户机是指请求信息的计算机或程序，而网络用于连接服务器与客户机，实现两者相互通信。但有时在某个网络中很难将服务器与客户机区分开。我们通常所说的“局域网”（Local Area Network，LAN），就是一群通过一定形式连接起来的计算机。它可以由两台计算机组成，也可以由同一区域内的上千台计算机组成。由LAN延伸到更大的范围，这样的网络称为“广域网”（Wide Area Network，WAN）。我们熟悉的因特网（Internet），则是由无数的LAN和WAN组成。</p>
<p><img src="https://gitee.com/liangxinixn/blog002/raw/master/image01/20210217153720.png"></p>
<h6 id="网络协议"><a href="#网络协议" class="headerlink" title="网络协议"></a>网络协议</h6><p>网络协议规定了计算机之间连接的物理、机械（网线与网卡的连接规定）、电气（有效的电平范围）等特征以及计算机之间的相互寻址规则、数据发送冲突的解决、长的数据如何分段传送与接收等。就像不同的国家有不同的法律一样，目前网络协议也有多种，下面简单地介绍几个常用的网络协议。</p>
<ul>
<li>IP协议：Internet依靠TCP/IP协议，在全球范围内实现不同硬件结构，不同操作系统，不同网络系统互联。这个地址就是IP地址，32位二进制数表示。为了方便，每个字节用十进制数表示。由于IPV4有限，出现了16个字节的IPV6。TCP/IP模式是一种层次结构，分为应用层、传输层、互联网层、网络层。</li>
<li>TCP与UDP协议：在TCP/IP协议栈中，有两个高级协议是网络应用程序编写者应该了解的。传输控制协议（TCP）和用户数据报协议（UDP）。TCP协议是一种以固接连线的协议，提供两台计算机之间可靠的数据传送；数据精确送达，适合可靠性要求比较高的场合，像HTTP、FTP和Telnet。</li>
<li>UDP是无连接通信协议，不保证可靠的数据传输，可以向多个目标发送数据和接受多个源的数据。适合准确性要求不高的地方，如网络聊天室和在线影片库，还有游戏。</li>
</ul>
<h6 id="端口与套接字——端口"><a href="#端口与套接字——端口" class="headerlink" title="端口与套接字——端口"></a>端口与套接字——端口</h6><p>一般而言，一台计算机只有单一的连到网络的“物理连接”（Physical Connection），所有的数据都通过此连接对内、对外送达特定的计算机。这就是端口。网络程序设计中的端口（port）并非真实的物理存在，而是一个假想的连接装置。端口被规定为一个在0~65535之间的整数。HTTP服务一般使用80端口，FTP服务使用21端口。假如一台计算机提供了HTTP、FTP等多种服务，那么客户机通过不同的端口来确定连接到服务器的哪项服务上，如下图所示。</p>
<p><img src="https://gitee.com/liangxinixn/blog002/raw/master/image01/20210217170337.png"></p>
<p>网络程序中套接字（Socket）用于将应用程序与端口连接起来。套接字是一个假想的连接装置，就像插插头的设备“插座”，用于连接电器与电线，如下图所示。Java将套接字抽象化为类，程序设计者只需创建Socket类对象，即可使用套接字。</p>
<p><img src="https://gitee.com/liangxinixn/blog002/raw/master/image01/20210217170409.png"></p>
<h4 id="2-TCP程序设计基础"><a href="#2-TCP程序设计基础" class="headerlink" title="2.TCP程序设计基础"></a>2.TCP程序设计基础</h4><h6 id="InetAddress类"><a href="#InetAddress类" class="headerlink" title="InetAddress类"></a>InetAddress类</h6><p>java.net包中InetAddress类是与IP地址相关的类，利用该类可以获取IP地址、主机地址等信息。InetAddress类的常用方法如下表所示。</p>
<p><img src="https://gitee.com/liangxinixn/blog002/raw/master/image01/20210217171544.png"></p>
<ul>
<li>获取本地主机名和IP地址</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">import java.net.*;

public class Address { // 创建类
	public static void main(String[] args) {
		InetAddress ip; // 创建InetAddress对象
		try { // try语句块捕捉可能出现的异常
			ip = InetAddress.getLocalHost(); // 实例化对象
			String localname = ip.getHostName(); // 获取本机名
			String localip = ip.getHostAddress(); // 获取本IP地址
			System.out.println("本机名：" + localname);// 将本机名输出
			System.out.println("本机IP地址：" + localip); // 将本机IP输出
		} catch (UnknownHostException e) {
			e.printStackTrace(); // 输出异常信息
		}
	}
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h6 id="ServerSocket类"><a href="#ServerSocket类" class="headerlink" title="ServerSocket类"></a>ServerSocket类</h6><blockquote>
<p>java.net包中ServerSocket类用于表示服务器套接字，其主要功能是等待来自网络上的“请求”，它可通过指定的端口来等待连接的套接字。服务器套接字一次可以与一个套接字连接。如果多台客户机同时提出连接请求，服务器套接字会将请求连接的客户机存入列队中，然后从中取出一个套接字，与服务器新建的套接字连接起来。若请求连接数大于最大容纳数，则多出的连接请求被拒绝。队列的默认大小是50。</p>
</blockquote>
<p>ServerSocket类的构造方法都抛出IOException异常，分别有以下几种形式。</p>
<ul>
<li>ServerSocket()：创建非绑定服务器套接字。</li>
<li>ServerSocket(int port)：创建绑定到特定端口的服务器套接字。</li>
<li>ServerSocket(int port, int backlog)：利用指定的backlog创建服务器套接字并将其绑定到指定的本地端口号。</li>
<li>ServerSocket(int port, int backlog, InetAddress bindAddress)：使用指定的端口、侦听backlog和要绑定到的本地IP地址创建服务器。这种情况适用于计算机上有多块网卡和多个IP的情况，我们可以明确规定ServerSocket在哪块网卡或IP地址上等待客户的连接请求。</li>
</ul>
<h6 id="TCP网络程序"><a href="#TCP网络程序" class="headerlink" title="TCP网络程序"></a>TCP网络程序</h6><blockquote>
<p>知道了TCP程序的工作过程，就可以编写TCP服务器程序了。在网络编程中如果只要求客户机向服务器发送消息，不用服务器向客户机发送消息，称为单向通信。客户机套接字和服务器套接字连接成功后，客户机通过输出流发送数据，而服务器会使用输入流接收数据。下面是简单的单向通信的实例。</p>
</blockquote>
<ul>
<li>服务端程序</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">package com.lzw;
import java.io.*;
import java.net.*;

public class MyTcp { // 创建类MyTcp
	private BufferedReader reader; // 创建BufferedReader对象
	private ServerSocket server; // 创建ServerSocket对象
	private Socket socket; // 创建Socket对象socket
	
	void getserver() {
		try {
			server = new ServerSocket(8998); // 实例化Socket对象
			System.out.println("服务器套接字已经创建成功"); // 输出信息
			while (true) { // 如果套接字是连接状态
				System.out.println("等待客户机的连接"); // 输出信息
				socket = server.accept(); // 实例化Socket对象
				reader = new BufferedReader(new InputStreamReader(socket
						.getInputStream())); // 实例化BufferedReader对象
				getClientMessage(); // 调用getClientMessage()方法
			}
		} catch (Exception e) {
			e.printStackTrace(); // 输出异常信息
		}
	}
	
	private void getClientMessage() {
		try {
			while (true) { // 如果套接字是连接状态
				if (reader.ready()) {
					// 获得客户端信息
					System.out.println("客户机:" + reader.readLine());
				}
			}
		} catch (Exception e) {
			e.printStackTrace(); // 输出异常信息
		}
		try {
			if (reader != null) {
				reader.close(); // 关闭流
			}
			if (socket != null) {
				socket.close(); // 关闭套接字
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) { // 主方法
		MyTcp tcp = new MyTcp(); // 创建本类对象
		tcp.getserver(); // 调用方法
	}
}
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>客户端程序</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">package com.lzw;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

import javax.swing.*;
import javax.swing.border.*;

public class MyClien extends JFrame { // 创建类继承JFrame类
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private PrintWriter writer; // 声明PrintWriter类对象
	Socket socket; // 声明Socket对象
	private JTextArea ta = new JTextArea(); // 创建JtextArea对象
	private JTextField tf = new JTextField(); // 创建JtextField对象
	Container cc; // 声明Container对象
	
	public MyClien(String title) { // 构造方法
		super(title); // 调用父类的构造方法
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		cc = this.getContentPane(); // 实例化对象

		final JScrollPane scrollPane = new JScrollPane();
		scrollPane.setBorder(new BevelBorder(BevelBorder.RAISED));
		getContentPane().add(scrollPane, BorderLayout.CENTER);
		scrollPane.setViewportView(ta);
		cc.add(tf, "South"); // 将文本框放在窗体的下部
		tf.addActionListener(new ActionListener() {
			// 绑定事件
			public void actionPerformed(ActionEvent e) {
				// 将文本框中信息写入流
				writer.println(tf.getText());
				// 将文本框中信息显示在文本域中
				ta.append(tf.getText() + '\n');
				ta.setSelectionEnd(ta.getText().length());
				tf.setText(""); // 将文本框清空
			}
		});
	}
	
	private void connect() { // 连接套接字方法
		ta.append("尝试连接\n"); // 文本域中提示信息
		try { // 捕捉异常
			socket = new Socket("127.0.0.1", 8998); // 实例化Socket对象
			writer = new PrintWriter(socket.getOutputStream(), true);
			ta.append("完成连接\n"); // 文本域中提示信息
		} catch (Exception e) {
			e.printStackTrace(); // 输出异常信息
		}
	}
	
	public static void main(String[] args) { // 主方法
		MyClien clien = new MyClien("向服务器送数据"); // 创建本例对象
		clien.setSize(200, 200); // 设置窗体大小
		clien.setVisible(true); // 将窗体显示
		clien.connect(); // 调用连接方法
	}
}
 <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-UDP程序设计基础"><a href="#3-UDP程序设计基础" class="headerlink" title="3.UDP程序设计基础"></a>3.UDP程序设计基础</h4><p>基于UDO通信的基本模式：</p>
<ul>
<li>将数据打包，发往目的地</li>
<li>接受别人发来的数据包，然后查看数据包</li>
</ul>
<p>发送步骤：</p>
<ul>
<li>DatagramSocket()创建一个数据包嵌套字</li>
<li>DatagramPacket创建要发送的数据包</li>
<li>DatagramSocket的send（）方法发送数据包</li>
</ul>
<p>接受步骤：</p>
<ul>
<li>DatagramSocket()创建数据包嵌套字，绑定到指定端口</li>
<li>DatagramPacket创建字节数组来接受数据包</li>
<li>DatagramSocket的receive()方法接受UDP包</li>
</ul>
<h6 id="DatagramPacket类"><a href="#DatagramPacket类" class="headerlink" title="DatagramPacket类"></a>DatagramPacket类</h6><p>java.net包的DatagramPacket类用来表示数据包。Datagram Packet类的构造函数有：</p>
<ul>
<li>DatagramPacket(byte[] buf , int length)</li>
<li>DatagramPacket(byte[] buf , int length , InetAddress address , int port)</li>
</ul>
<blockquote>
<p>第一种构造函数创建DatagramPacket对象，指定了数据包的内存空间和大小。第二种构造函数不仅指定了数据包的内存空间和大小，而且指定了数据包的目标地址和端口。在发送数据时，必须指定接收方的Socket地址和端口号，因此使用第二种构造函数可创建发送数据的DatagramPacket对象。</p>
</blockquote>
<h6 id="DatagramSocket类"><a href="#DatagramSocket类" class="headerlink" title="DatagramSocket类"></a>DatagramSocket类</h6><p>java.net包中的DatagramSocket类用于表示发送和接收数据包的套接字。该类的构造函数有：</p>
<ul>
<li>DatagramSocket()</li>
<li>DatagramSocket(int port )</li>
<li>DatagramSocket(int port , InetAddress addr)</li>
</ul>
<blockquote>
<p>第一种构造函数创建DatagramSocket对象，构造数据报套接字并将其绑定到本地主机上任何可用的端口。使用第二种构造函数创建DatagramSocket对象，创建数据报套接字并将其绑定到本地主机上的指定端口。第三种构造函数创建DatagramSocket对象，创建数据报套接字，将其绑定到指定的本地地址。第三种构造函数适用于有多块网卡和多个IP的情况。</p>
</blockquote>
<h6 id="UDP网络程序"><a href="#UDP网络程序" class="headerlink" title="UDP网络程序"></a>UDP网络程序</h6><ul>
<li>广播主机程序不断向外播出信息</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">import java.net.*;

public class Weather extends Thread { // 创建类。该类为多线程执行程序
	String weather = "节目预报：八点有大型晚会，请收听";
	int port = 9898; // 定义端口
	InetAddress iaddress = null; // 创建InetAddress对象
	MulticastSocket socket = null; // 声明多点广播套接字
	
	Weather() { // 构造方法
		try {
			// 实例化InetAddress，指定地址
			iaddress = InetAddress.getByName("224.255.10.0");
			socket = new MulticastSocket(port); // 实例化多点广播套接字
			socket.setTimeToLive(1); // 指定发送范围是本地网络
			socket.joinGroup(iaddress); // 加入广播组
		} catch (Exception e) {
			e.printStackTrace(); // 输出异常信息
		}
	}
	
	public void run() { // run()方法
		while (true) {
			DatagramPacket packet = null; // 声明DatagramPacket对象
			byte data[] = weather.getBytes(); // 声明字节数组
			// 将数据打包
			packet = new DatagramPacket(data, data.length, iaddress, port);
			System.out.println(new String(data)); // 将广播信息输出
			try {
				socket.send(packet); // 发送数据
				sleep(3000); // 线程休眠
			} catch (Exception e) {
				e.printStackTrace(); // 输出异常信息
			}
		}
	}
	
	public static void main(String[] args) { // 主方法
		Weather w = new Weather(); // 创建本类对象
		w.start(); // 启动线程
	}
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>


<ul>
<li>接受广播程序</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">import java.awt.*;
import java.awt.event.*;
import java.net.*;

import javax.swing.*;

public class Receive extends JFrame implements Runnable, ActionListener {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	int port; // 定义int型变量
	InetAddress group = null; // 声明InetAddress对象
	MulticastSocket socket = null; // 创建多点广播套接字对象
	JButton ince = new JButton("开始接收"); // 创建按钮对象
	JButton stop = new JButton("停止接收");
	JTextArea inceAr = new JTextArea(10, 10); // 显示接收广播的文本域
	JTextArea inced = new JTextArea(10, 10);
	Thread thread; // 创建Thread对象
	boolean b = false; // 创建boolean型变量
	
	public Receive() { // 构造方法
		super("广播数据报"); // 调用父类方法
		setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		thread = new Thread(this);
		ince.addActionListener(this); // 绑定按钮ince的单击事件
		stop.addActionListener(this); // 绑定按钮stop的单击事件
		inceAr.setForeground(Color.blue); // 指定文本域中文字颜色
		JPanel north = new JPanel(); // 创建Jpane对象
		north.add(ince); // 将按钮添加到面板north上
		north.add(stop);
		add(north, BorderLayout.NORTH); // 将north放置在窗体的上部
		JPanel center = new JPanel(); // 创建面板对象center
		center.setLayout(new GridLayout(1, 2)); // 设置面板布局
		center.add(inceAr); // 将文本域添加到面板上

		final JScrollPane scrollPane = new JScrollPane();
		center.add(scrollPane);
		scrollPane.setViewportView(inced);
		add(center, BorderLayout.CENTER); // 设置面板布局
		validate(); // 刷新
		port = 9898; // 设置端口号
		try {
			group = InetAddress.getByName("224.255.10.0"); // 指定接收地址
			socket = new MulticastSocket(port); // 绑定多点广播套接字
			socket.joinGroup(group); // 加入广播组
		} catch (Exception e) {
			e.printStackTrace(); // 输出异常信息
		}
		setBounds(100, 50, 360, 380); // 设置布局
		setVisible(true); // 将窗体设置为显示状态
	}
	
	public void run() { // run()方法
		while (true) {
			byte data[] = new byte[1024]; // 创建byte数组
			DatagramPacket packet = null; // 创建DatagramPacket对象
			// 待接收的数据包
			packet = new DatagramPacket(data, data.length, group, port);
			try {
				socket.receive(packet); // 接收数据包
				String message = new String(packet.getData(), 0, packet
						.getLength()); // 获取数据包中内容
				// 将接收内容显示在文本域中
				inceAr.setText("正在接收的内容：\n" + message);
				inced.append(message + "\n"); // 每条信息为一行
			} catch (Exception e) {
				e.printStackTrace(); // 输出异常信息
			}
			if (b == true) { // 当变量等于true时，退出循环
				break;
			}
		}
	}
	
	public void actionPerformed(ActionEvent e) { // 单击事件
		if (e.getSource() == ince) { // 单击按钮ince触发的事件
			ince.setBackground(Color.red); // 设置按钮颜色
			stop.setBackground(Color.yellow);
			if (!(thread.isAlive())) { // 如线程不处于“新建状态”
				thread = new Thread(this); // 实例化Thread对象
			}
			thread.start(); // 启动线程
			b = false; // 设置变量值
		}
		if (e.getSource() == stop) { // 单击按钮stop触发的事件
			ince.setBackground(Color.yellow); // 设置按钮颜色
			stop.setBackground(Color.red);
			b = true; // 设置变量值s
		}
	}
	
	public static void main(String[] args) { // 主方法
		Receive rec = new Receive(); // 创建本类对象
		rec.setSize(460, 200); // 设置窗体大小
	}
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h6 id="作业"><a href="#作业" class="headerlink" title="作业"></a>作业</h6><ul>
<li>获取指定端口的主机名，主机地址和本机地址</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">import java.net.*;

public class MyHost {
	public static void main(String args[]) {
		InetAddress ip = null;
		
		try {
			ip = InetAddress.getByName("localhost");// 修改为指定的主机名称
			System.out.println("主机名：" + ip.getHostName());
			System.out.println("主机IP地址：" + ip.getHostAddress());
			System.out.println("本机IP地址："
					+ InetAddress.getLocalHost().getHostAddress());
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		
	}
}
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>8001端口上等待ServerSocker对象，当接受到一个客户机的连接请求后，建立输出/输出流。通过输出流向客户机发送信息</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">package com.lzw;

import java.io.*;
import java.net.*;

/**
 * @author Administrator
 */
public class ComputerServer {
	public static void main(String[] args) {
		try {
			ServerSocket ss = new ServerSocket(8001);
			while (!ss.isClosed()) {
				Socket s = ss.accept();
				InputStream ips = s.getInputStream();
				OutputStream ops = s.getOutputStream();
				String str = "欢迎进入程序\n2．编写TCP服务器程序，"
						+ "实现创建一个在8001端口上等待的ServerSocket"
						+ "对象，当接收到一个客户机的连接请求后，"
						+ "程序从与客户机建立了连接的Socket对象中获得输入输出"
						+ "流。通过输出流向客户机发送信息。";
				ops.write(str.getBytes());
				byte[] buf = new byte[1024];
				int len = 0;
				if (ips.available() &gt; 0)
					len = ips.read(buf);
				System.out.println(new String(buf, 0, len));
				ips.close();
				ops.close();
				s.close();
			}
			ss.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">package com.lzw;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

import javax.swing.*;

public class TestClient extends JFrame {
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private JTextArea textArea;
	private JTextField portField;
	private JTextField hostField;
	
	/**
	 * Launch the application
	 * 
	 * @param args
	 */
	public static void main(String args[]) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					TestClient frame = new TestClient();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
	
	/**
	 * Create the frame
	 */
	public TestClient() {
		super();
		setBounds(100, 100, 500, 212);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		final JPanel panel = new JPanel();
		panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
		getContentPane().add(panel, BorderLayout.NORTH);
		
		final JLabel label = new JLabel();
		label.setText("连接主机：");
		panel.add(label);
		
		hostField = new JTextField();
		hostField.setText("localhost");
		panel.add(hostField);
		
		final JLabel label_1 = new JLabel();
		label_1.setText("端口：");
		panel.add(label_1);
		
		portField = new JTextField();
		portField.setText("8001");
		panel.add(portField);
		
		final JButton button = new JButton();
		button.addActionListener(new ActionListener() {
			public void actionPerformed(final ActionEvent e) {
				final String hostName = hostField.getText();
				String portNum = portField.getText();
				final int port = Integer.parseInt(portNum);
				new Thread() {
					public void run() {
						try {
							final InetAddress host = InetAddress.getByName(hostName);
							Socket socket = new Socket(host, port);
							final InputStream is = socket.getInputStream();
							InputStreamReader reader=new InputStreamReader(is);
							int data = 0;
							while ((data=reader.read()) != -1) {
								textArea.append((char)data+"");
								textArea.revalidate();
								Thread.sleep(100);
							}
						} catch (Exception e1) {
							textArea.append(e1.toString());
							e1.printStackTrace();
						}
					}
				}.start();
				
			}
		});
		button.setText("连接");
		panel.add(button);
		
		final JScrollPane scrollPane = new JScrollPane();
		getContentPane().add(scrollPane, BorderLayout.CENTER);
		
		textArea = new JTextArea();
		textArea.setLineWrap(true);
		scrollPane.setViewportView(textArea);
	}
}
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>聊天室程序</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

import javax.swing.*;

public class TCPClient extends JFrame {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	TextArea taContent = new TextArea();
	JTextField tfTxt = new JTextField(20);
	
	JButton send = new JButton("发送");
	JButton connect = new JButton("连接");
	JButton clear = new JButton("清空");
	
	boolean live = false;
	JPanel p1 = new JPanel();
	JPanel p2 = new JPanel();
	
	Socket s = null;
	DataOutputStream dos = null;
	DataInputStream dis = null;
	
	boolean bConnected = false;
	
	Thread t = new Thread(new RecToServer());
	
	public void launchFrame() {
		
		taContent.setEditable(false);
		
		p2.setLayout(new FlowLayout(FlowLayout.CENTER, 10, 5));
		p2.add(send);
		p2.add(connect);
		p2.add(clear);
		
		Container con = this.getContentPane();
		
		con.add(taContent, "North");
		con.add(tfTxt, "Center");
		con.add(p2, "South");
		
		this.setSize(300, 350);
		this.setLocation(400, 200);
		this.setTitle("Chat Client");
		
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		connect.addActionListener(new Connect());
		send.addActionListener(new SendMsg());
		clear.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				taContent.setText("");
			}
		});
	}
	
	public void connectToServer() {
		try {
			
			s = new Socket("127.0.0.1", 8888);
			dos = new DataOutputStream(s.getOutputStream());
			dis = new DataInputStream(s.getInputStream());
			
			bConnected = true;
			
		} catch (BindException e) {
			System.out.println("找不到指定的服务器");
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	
	public void disConnect() {
		try {
			if (s != null) {
				s.close();
			}
			
			if (dos != null) {
				dos.close();
			}
			if (dis != null) {
				dis.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String args[]) {
		TCPClient tc = new TCPClient();
		tc.launchFrame();
	}
	
	private class Connect implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			if (e.getActionCommand() == "连接") {
				
				connectToServer();
				try {
					t.start();
				} catch (IllegalThreadStateException ex) {
					
				}
				
				connect.setText("断开连接");
				
			} else if (e.getActionCommand() == "断开连接") {
				disConnect();
				connect.setText("连接");
			}
			
		}
	}
	
	private class SendMsg implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			if (connect.getActionCommand() == "连接") {
				JOptionPane.showMessageDialog(TCPClient.this,
						"没有找到指定的服务器", "错误提示", 1);
			} else {
				String str = tfTxt.getText();
				tfTxt.setText("");
				
				try {
					dos.writeUTF(str);
					dos.flush();
				} catch (SocketException ex) {
					System.out.println("没有找到指定的服务器");
					JOptionPane.showMessageDialog(TCPClient.this,
							"没有找到指定的服务器", "错误提示", 1);
				} catch (IOException ex) {
					ex.printStackTrace();
				}
			}
			
		}
	}
	
	private class RecToServer implements Runnable {
		public void run() {
			try {
				while (bConnected) {
					String str = dis.readUTF();
					// System.out.println(str);
					
					taContent.append(str + "\n");
				}
			} catch (SocketException e) {
				System.out.println("服务器已关闭");
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-none"><code class="language-none">// 服务器端程序
import java.awt.*;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.List;

import javax.swing.*;

public class TCPServer extends JFrame {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private ServerSocket ss = null;
	private boolean bStart = false;
	
	private JTextArea taContent = new JTextArea();
	
	private int index = 0;
	
	List&lt;Client&gt; clients = new ArrayList&lt;Client&gt;();
	
	public void launchFrame() {
//		Container con = this.getContentPane();
		taContent.setEditable(false);
		
		taContent.setBackground(Color.DARK_GRAY);
		taContent.setForeground(Color.YELLOW);
		this.add(taContent);
		this.setSize(300, 350);
		this.setLocation(400, 200);
		this.setTitle("TCP Server");
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		tcpMonitor();
	}
	
	public void tcpMonitor() {
		try {
			ss = new ServerSocket(8888);
			bStart = true;
		} catch (IOException e) {
			
			e.printStackTrace();
		}
		
		try {
			while (bStart) {
				index++;
				Socket s = ss.accept();
				Client c = new Client(s);
				clients.add(c);
				
				taContent.append(s.getInetAddress().getHostAddress()
						+ " connected " + index + " clients\n");
				new Thread(c).start();
				
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				ss.close();
			} catch (IOException e) {
				
				e.printStackTrace();
			}
		}
		
	}
	
	public static void main(String args[]) {
		TCPServer ts = new TCPServer();
		ts.launchFrame();
	}
	
	private class Client implements Runnable {
		DataInputStream dis = null;
		DataOutputStream dos = null;
		
		Socket s = null;
		boolean bStart = false;
		
		Client(Socket s) {
			this.s = s;
			try {
				dis = new DataInputStream(s.getInputStream());
				dos = new DataOutputStream(s.getOutputStream());
			} catch (IOException e) {
				e.printStackTrace();
			}
			
			bStart = true;
		}
		
		public void sendToEveryClient(String str) {
			try {
				dos.writeUTF(str);
				dos.flush();
				
			} catch (IOException e) {
				index--;
				clients.remove(this);
				taContent.append(s.getInetAddress().getHostAddress()
						+ " exited " + index + " clients\n");
				System.out.println("对方退出了！我从List里面去掉了！");
			}
		}
		
		public void run() {
			try {
				while (bStart) {
					String str = dis.readUTF();
					System.out.println(str);
					for (int i = 0; i &lt; clients.size(); i++) {
						Client c = clients.get(i);
						c.sendToEveryClient(str);
					}
				}
			} catch (EOFException e) {
				clients.remove(this);
				taContent.append(s.getInetAddress().getHostAddress()
						+ " exited " + clients.size() + " clients\n");
				System.out.println("client closed");
			} catch (SocketException e) {
				System.out.println("client closed");
			} catch (IOException e) {
				e.printStackTrace();
			} finally {
				try {
					if (s != null)
						s.close();
					if (dis != null)
						dis.close();
					if (dos != null)
						dos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		
	}
	
}
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

                
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